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how can we give input to parent shell?
i mean shell that is creating a child and our c prograame will run on that child..and then it return to parent shell..


what i want to do i want execute a...

it's coooool.
but how does it work?
how creation of /etc/nologin file restrict all the users except superuser....:eek:

thanx for all this information.........
:b:

thanx for this information......
but i would like to know one more thing that why do we need 2 kind of blocks
one block of size 512 bytes & another if I/o BLOCK of 4096 bytes.
wat is the use of...

how can superuser stop all other users login on system without changing in /etc/passwd file and without using userdel command?

it means that if i increase in data of file,then it would occupy 16 blocks on disk
even if size of file is less than 16 block but greater than 8 blocks?
and why do we need block for allocation?

the output of stat command is
Size: 238 Blocks: 8 IO Block: 4096 regular file
Device: 80ah/2058d Inode: 736783 Links: 1
Access: (0664/-rw-rw-r--) Uid: ( 500/ ...